CN202267731U

CN202267731U - Netting twine tester

Info

Publication number: CN202267731U
Application number: CN2011203212418U
Authority: CN
Inventors: 牛光峰
Original assignee: Zhengzhou Synthetic Diamond and Products Engineering Technology Research Center Co Ltd
Current assignee: Zhengzhou Synthetic Diamond and Products Engineering Technology Research Center Co Ltd
Priority date: 2011-08-30
Filing date: 2011-08-30
Publication date: 2012-06-06
Anticipated expiration: 2021-08-30

Abstract

The utility model discloses a netting twine tester, comprising a pulse generating circuit, a pulse distribution circuit, an electronic switch circuit, an amplification circuit, a comparison circuit, a first socket and a second socket used for inserting the two ends of a netting twine respectively. The signal output end of the pulse generating circuit is connected with the input end of the pulse distribution circuit, the output end of the pulse distribution circuit is connected with the input end of the electronic switch circuit, and the output end of the electronic switch circuit is connected with the pins of the first socket separately; the pins of the second socket are connected with a power supply and also the input end of the amplification circuit, and the pins of the second socket and the output end of the amplification circuit are connected with the non-inverting input end of the comparison circuit; the inverting input end of the comparison circuit is connected with the power supply via an adjustable resistor, and the output end of the comparison circuit is connected with the reset end of the pulse generating circuit. During the test process, without needing a resistor tester, the resistor of each core wire of the netting twine can be measured whether to be qualified conveniently and rapidly.

Description

A kind of network cable tester

Technical field

The utility model relates to the proving installation of netting twine, relates in particular to network cable tester.

Background technology

Following of present netting twine testing apparatus general condition is made simple test to the break-make of netting twine, is difficult to that the resistance sizes of netting twine is made one and significantly defines.And good testing apparatus, function is very complete, but price lets the people can not accept; Often do not possess such condition in general maintenance department; And when whether needs mensuration netting twine resistance exceeds standard, need with measurement of resistance test set, under large batch of situation; Not only waste time and energy, and the test confidence level is very low.

The utility model content

The purpose of the utility model provides a kind of network cable tester, can measure exactly netting twine resistance is convenient.

The utility model adopts following technical proposals: a kind of network cable tester; Pulse-generating circuit, pulse distributor, electronic switching circuit, amplifying circuit and comparator circuit, be used for first socket and second socket that the two ends of netting twine are inserted respectively; The signal output part of pulse-generating circuit is connected with the input end of pulse distributor; The output terminal of pulse distributor is connected with the input end of electronic switching circuit, and the output terminal of electronic switch is connected with the pin of first socket respectively, and the pin of second socket connects power supply; The pin of second socket also is connected with the input end of amplifying circuit; The output terminal of the pin amplifying circuit of second socket is connected with the in-phase input end of comparator circuit, and the inverting input of comparator circuit connects power supply through adjustable resistance, and the output terminal of comparator circuit is connected with the reset terminal of pulse-generating circuit.

Described first socket and second socket all have 8 pins, are used to test eight core netting twines.

Also comprise the 3rd socket and the 4th socket, the 3rd socket and the 4th socket all have 2 pins, are used to test two core netting twines, and the pin of the 3rd socket is connected with two pins of first socket, and the 4th socket is parallelly connected with second socket.

The reset terminal of two circulation figure place ends of described pulse distributor and eight circulation figure place ends and pulse distributor is connected with circulation figure place change-over switch.

Be connected with the passage indicating circuit between the output terminal of described pulse distributor and the input end of electronic switch.

The reset terminal of described pulse-generating circuit is connected with hand switch, and the hand switch other end connects power supply.

Thereby the utility model judges through the voltage of measuring every heart yearn of netting twine whether resistance is qualified, utilizes the electrical feedback technology to come quick switch test object and comparison resistance size, and participates in without resistance test set in the test process, and measuring process is fast convenient; Can detect two types of two cores and eight core netting twines, which heart yearn is undesirable, and which pilot lamp will stop at, and the signal fault indication is clear and definite; Travelling speed is fast, and accuracy is high.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model.

Embodiment

As shown in Figure 1; The utility model network cable tester comprises pulse-generating circuit, pulse distributor, electronic switching circuit, amplifying circuit and comparator circuit, the first socket J1 and the second socket J2, the 3rd socket J3 and the 4th socket J4; The described first socket J1 and the second socket J2 all have 8 pins; Be used to test eight core netting twines, the 3rd socket J3 and the 4th socket J4 all have 2 pins, are used to test two core netting twines; Two pins of the 3rd socket J3 are connected with two pins of the first socket J1, and the 4th socket J4 is parallelly connected with the second socket J2.Pulse-generating circuit produces chip U2 (CA555E) by pulse and peripheral circuit constitutes, and the reset terminal that pulse produces chip U2 is connected with hand switch S1, and the hand switch S1 other end connects power supply+12V; The signal output part (pin 3) that pulse produces chip U2 is connected with the input end of pulse distributor; Pulse distributor is made up of pulse distribution chip U3 (CD4017) and peripheral circuit thereof, and capacitor C 5 has been formed reset circuit with resistance R 3, and (pin Q0～Q7) is connected with eight passage indicating circuits respectively to eight output terminals of pulse distribution chip U3; The passage indicating circuit is made up of resistance and light emitting diode; Two circulation figure place ends (pin Q3) and eight circulation figure place ends (pin Q8) are connected with circulation figure place change-over switch S2 with pulse distribution chip U3 reset terminal (pin RST), are used to switch the circulation measurement of eight core netting twines and two core netting twines; The output terminal of eight passage indicating circuits is connected with the input end of eight electronic switches respectively.Eight electronic switches adopt eight triode T1～T8, and the base stage of eight triode T1～T8 is connected with the output terminal of eight passage indicating circuits respectively, the grounded emitter of eight triode T1～T8; The collector of eight triode T1～T8 is connected with eight pins of the first socket J1 respectively.Eight pins of the second socket J2 all connect power supply through resistance R 17; Power supply also is connected with filter capacitor C6; Eight pins of the second socket J2 all are connected with the in-phase input end of amplifying circuit U4A; The inverting input of amplifying circuit U4A and output terminal are connected with variable resistor RP2, can regulate the enlargement factor of amplifying circuit.The output terminal of amplifying circuit U4A is connected with the inverting input of comparator circuit U4B; The in-phase input end of comparator circuit U4B connects power supply after connecting variable resistor RP1; The in-phase input end of comparator circuit U4B also connects resistance R 13 back ground connection; Variable resistor RP1 and resistance R 13 are formed bleeder circuit, and adjustment variable resistor RP1 can change the size of voltage fiducial value, is mainly used in the controlled quentity controlled variable of setting the netting twine resistance sizes; The output terminal of comparator circuit U4B is connected with the reset terminal that pulse produces chip U2.The power circuit of generation+12V is a known technology, repeats no more at this.

Because netting twine resistance is big more, the voltage of generation will be high more, thereby can confirm the size of the resistance of the every heart yearn of netting twine through the height of measuring the every heart yearn voltage of netting twine.As shown in Figure 1, when measuring eight core netting twines, the first socket J1 and the second socket J2 are inserted in the two ends of eight core netting twines, change-over switch S2 beats at eight circulation figure place end positions, gets final product through adjustable resistance RP1, adjustable resistance RP2 setting value, and tester is operation automatically just.It is that pulse distributor provides pulse signal that pulse produces chip U2; The pulse signal that produces exports the input end (pin 14) of pulse distribution chip U3 to from the pin 3 of pulse generation chip U2; Then the pin 3 (Q0) of pulse distribution chip U3 is exported high level; This voltage is through base stage, the emitter of resistance R 4, LED 2 and triode Q1, and diode (LED) 2 is luminous; This moment, triode Q1 was in state of saturation, and the collector of triode Q1 and emitter just are equivalent to the switch of a connection.12V voltage is added in above first pin of the second socket J2 through resistance R 17; And first heart yearn of first pin of the second socket J2 through netting twine reaches above first pin of the first socket J1; And first pin of the first socket J1 links to each other with the collector of triode Q2, thereby the voltage between first pin of the second socket J2 and the ground end is exactly the voltage of netting twine first heart yearn.The voltage of netting twine amplifies through amplifying circuit U4A, then this voltage is sent to comparator circuit U4B, and comparator circuit U4B compares voltage and setting value.When netting twine resistance when setting resistance value, explain that netting twine is good, the inverting input voltage of comparator circuit U4B is lower than in-phase input end voltage at this moment; Output terminal is just exported high level, flows to the reset terminal (pin 4) that pulse produces chip U2 through resistance R 17, and pulse produces chip U2 output pulse; The output displacement of pulse distributor U3, output terminal Q0 becomes low level, and Q1 becomes high level; Begin to judge second heart yearn of eight core netting twines; If the second heart yearn resistance surpasses setting value very greatly, then comparator circuit U4B will output low level, and pulse produces chip U2 and stops to export pulse; The output of pulse distributor U3 no longer is shifted, and LED 3 will not go out always.If the resistance of the inner every heart yearn of netting twine all meets the requirements; After having surveyed the octuple heart yearn; Pulse distribution chip U3 is added in above the reset terminal (RST) through diode D5, change-over switch S2 when Q8 exports; Pulse distribution chip U3 restarts output, the cycle detection always that tester will go round and begin again from Q0.If the position that netting twine has does not have heart yearn or this heart yearn resistance bigger, but when wanting to measure next heart yearn, can press hand switch S1, then pulse produces chip U2 output pulse, forces to make the output displacement of pulse distributor U3.When measuring two heart yearn netting twines, to beat change-over switch S2 to two core netting twine measuring positions, measuring process is identical with said process.

Claims

1. network cable tester; It is characterized in that: pulse-generating circuit, pulse distributor, electronic switching circuit, amplifying circuit and comparator circuit, be used for first socket and second socket that the two ends of netting twine are inserted respectively; The signal output part of pulse-generating circuit is connected with the input end of pulse distributor; The output terminal of pulse distributor is connected with the input end of electronic switching circuit, and the output terminal of electronic switch is connected with the pin of first socket respectively, and the pin of second socket connects power supply; The pin of second socket also is connected with the input end of amplifying circuit; The output terminal of the pin amplifying circuit of second socket is connected with the in-phase input end of comparator circuit, and the inverting input of comparator circuit connects power supply through adjustable resistance, and the output terminal of comparator circuit is connected with the reset terminal of pulse-generating circuit.

2. network cable tester according to claim 1 is characterized in that: described first socket and second socket all have 8 pins, are used to test eight core netting twines.

3. network cable tester according to claim 2; It is characterized in that: also comprise the 3rd socket and the 4th socket, the 3rd socket and the 4th socket all have 2 pins, are used to test two core netting twines; The pin of the 3rd socket is connected with two pins of first socket, and the 4th socket is parallelly connected with second socket.

4. network cable tester according to claim 3 is characterized in that: the reset terminal of two circulation figure place ends of described pulse distributor and eight circulation figure place ends and pulse distributor is connected with circulation figure place change-over switch.

5. network cable tester according to claim 4 is characterized in that: be connected with the passage indicating circuit between the output terminal of described pulse distributor and the input end of electronic switch.

6. network cable tester according to claim 5 is characterized in that: the reset terminal of described pulse-generating circuit is connected with hand switch, and the hand switch other end connects power supply.